Here is the full list of all 26 Lightyear Frontier achievements.
Get an upgrade at the Upgrade Depot.
Explore a ruin.
Restore a region.
Feed an animal for the first time.
Plant your first seed.
Remove 10 Noxious Slimes.
Scare away 10 animals.
Plant 100 seeds.
Plant 500 seeds.
Plant 1000 seeds.
Remove 50 Noxious Slimes.
Remove 150 Noxious Slimes.
Build the radio tower.
Remove 100 Noxious Weeds.
Remove 300 Noxious Weeds.
Remove 700 Noxious Weeds.
Increase Homestead Coziness to 1.
Increase Homestead Coziness to 2.
Increase Homestead Coziness to 3.
Explore 7 ruins.
Explore the vault in Outset Grasslands.
Feed 20 animals.
Feed 50 animals.
Restore all regions in Outset Grasslands.
Spray water at another player.
Get 10 upgrades at the Upgrade Depot.